JP4601592B2 - Rocker arm - Google Patents

Rocker arm Download PDF

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JP4601592B2
JP4601592B2 JP2006253416A JP2006253416A JP4601592B2 JP 4601592 B2 JP4601592 B2 JP 4601592B2 JP 2006253416 A JP2006253416 A JP 2006253416A JP 2006253416 A JP2006253416 A JP 2006253416A JP 4601592 B2 JP4601592 B2 JP 4601592B2
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roller
rocker arm
support
pair
support portions
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JP2008075481A (en
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清史 柵木
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Otics Corp
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Description

本発明は、動弁装置に用いられるロッカアームに関する。   The present invention relates to a rocker arm used in a valve gear.

ロッカアームとして、従来、特許文献１や特許文献２に記載されているものが知られている。この種のロッカアームは、図９及び図１０に示すように、アーム本体１００の前端部に二股に分かれた一対の支持部１０１を形成し、この支持部１０１によってローラ１０２のシャフト１０３の両端部を支持した構造となっていて、このローラ１０２をカムロブ（図示せず）の外周面上で転動させるようになっている。ロッカアームＲは、ローラ１０２をカムロブに転動させることにより前端部を往復移動させつつ揺動し、ロッカアームＲの揺動に伴なってバルブ（図示せず）が開閉移動するようになっている。
特開平３−２４２４０７号公報 特開平５−３２１６１５号公報 Conventionally, those described in Patent Document 1 and Patent Document 2 are known as rocker arms. As shown in FIGS. 9 and 10, this type of rocker arm is formed with a pair of support portions 101 divided into two forks at the front end portion of the arm body 100, and both ends of the shaft 103 of the roller 102 are formed by the support portions 101. The roller 102 is configured to roll on the outer peripheral surface of a cam lobe (not shown). The rocker arm R swings while the front end is reciprocated by rolling the roller 102 to the cam lobe, and a valve (not shown) is opened and closed as the rocker arm R swings.
JP-A-3-242407 Japanese Patent Laid-Open No. 5-321615

近年、低燃費化等のためにロッカアームＲの軽量化が望まれているが、軽量化の一手段としては、ロッカアームＲの揺動中心から偏心した前端部の重量を軽減するために支持部１０１を薄肉にする方法が考えられる。ところが、支持部１０１は、片持ち状に延出した形態であるため、薄肉にしてしまうと、ローラ１０２のシャフト１０３を支持するための強度が保てなくなる。
本発明は上記のような事情に基づいて完成されたものであって、ローラを支持している支持部の軽量化を実現することを目的とする。 In recent years, it has been desired to reduce the weight of the rocker arm R in order to reduce fuel consumption. As one means for reducing the weight, the support portion 101 is used to reduce the weight of the front end portion that is eccentric from the rocking center of the rocker arm R. It is conceivable to thin the wall. However, since the support portion 101 has a form extending in a cantilever manner, the strength for supporting the shaft 103 of the roller 102 cannot be maintained if the support portion 101 is thin.
The present invention has been completed based on the above-described circumstances, and an object of the present invention is to realize a weight reduction of a support portion that supports a roller.

上記の目的を達成するための手段として、請求項１の発明は、アーム本体の端部に、二股状に分かれて片持ち状に延出する形態の一対の支持部を形成し、前記一対の支持部の間に配置したローラを、前記一対の支持部によって回転可能に支持したロッカアームであって、前記一対の支持部における先端部同士を連結部によって連結したところに特徴を有する。   As a means for achieving the above object, the invention according to claim 1 is characterized in that a pair of support portions are formed at the ends of the arm body so as to be bifurcated and extend in a cantilever manner. A rocker arm in which a roller disposed between support portions is rotatably supported by the pair of support portions, and is characterized in that tip portions of the pair of support portions are connected by a connection portion.

また、この請求項１の発明は、前記連結部を前記ローラに近接した位置に配置し、前記連結部に、上方へ延出することで前記支持部の表面から弾き飛ばされたオイルを受け止める受け片を形成したところに特徴を有する。 The invention of the first aspect, the pre-Symbol connecting portion is disposed at a position close to said roller, said coupling portion, receiving the play skipped oil from the surface of the support portion by extending upward It is characterized in that a receiving piece is formed.

＜請求項１の発明＞
一対の支持部はアーム本体から片持ち状に延出するのであるが、一対の支持部の先端部同士を連結部によって連結したので、支持部が変形し難くなり、その分、支持部を薄肉化することができる。これにより、支持部、即ちアーム本体の端部を軽量化することができる。 <Invention of Claim 1>
The pair of support portions cantilevered from the arm main body, but since the tip portions of the pair of support portions are connected to each other by the connection portion, the support portions are difficult to deform, and the support portions are thinned accordingly. Can be Thereby, a support part, ie, the edge part of an arm main body, can be reduced in weight.

また、支持部から弾き飛ばされたオイルは、受け片で受け止められ、重力により受け片から連結部へ流れ落ちる。連結部はローラに接近して配置されているので、連結部に流れ落ちたオイルはローラに伝わる。 Further, the oil blown off from the support portion is received by the receiving piece and flows down from the receiving piece to the connecting portion by gravity. Since the connecting portion is disposed close to the roller, the oil that has flowed down to the connecting portion is transmitted to the roller.

＜参考形態１＞
以下、本発明の参考形態１を図１乃至図７を参照して説明する。本参考形態１のロッカアームＲａは、前後方向に長いアーム本体１０と、アーム本体１０の前端部に回転可能に支持したローラ２０と、アーム本体１０の後端部に設けたアジャストスクリュ２５とを備えて構成されている。ロッカアームＲａは、その長さ方向略中央位置の軸嵌孔１８に嵌合した支持軸３０を中心として、前端部側と後端部側を交互に上下動させるように揺動し得るようになっている。ローラ２０は、略卵形をなすカムロブ３１の外周上端部に当接し、アジャストスクリュ２５の下端面は上方へ付勢されたバルブステム３２の上端に当接させている。カムロブ３１が回転すると、カムロブ３１の外周上をローラ２０が転動することによってロッカアームＲａが揺動し、バルブステム３２が上下に往復移動するようになっている。 < Reference form 1>
Will be described below reference embodiment 1 of the present invention with reference to FIGS. Rocker arm Ra of the reference embodiment 1 is provided with a long arm body 10 in the longitudinal direction, and the roller 20 which is rotatably supported on a front end portion of the arm body 10, and a adjusting screw 25 provided at a rear end portion of the arm body 10 Configured. The rocker arm Ra can swing so that the front end side and the rear end side are alternately moved up and down around the support shaft 30 fitted in the shaft fitting hole 18 at a substantially central position in the length direction. ing. The roller 20 is in contact with the upper end of the outer periphery of the cam lobe 31 having a substantially egg shape, and the lower end surface of the adjusting screw 25 is in contact with the upper end of the valve stem 32 biased upward. When the cam lobe 31 rotates, the roller 20 rolls on the outer periphery of the cam lobe 31 to swing the rocker arm Ra, so that the valve stem 32 reciprocates up and down.

アーム本体１０の前端部には、二股に分かれて前方へ片持ち状に延出した形態の左右一対の支持部１１が形成されている。この一対の支持部１１はロッカアームＲａの揺動方向と平行な板状をなし、この両支持部１１には、左右方向に貫通する円形の軸受孔１２が同軸状に形成されている。支持部１１は、側方から見ると概ね三角形をなしており、支持部１１の延出端部は軸受孔１２と同心の円弧形をなしている。また、支持部１１の外側面は、アーム本体１０における軸嵌孔１８の周縁部領域及び軸嵌孔１８からアーム本体１０の後端部に至る領域の外側面に比べると、段差状に凹んだ形態となっている。つまり、支持部１１の形成されている前端部の幅寸法は、それ以外の幅寸法よりも小さい寸法とされ、支持部１１のみが幅狭となっている。両支持部１１の間は、上方、前方及び下方に開放された収容空間１３となっており、この収容空間１３内にはローラ２０が収容されている。   A pair of left and right support portions 11 are formed at the front end portion of the arm body 10 so as to be bifurcated and extend forward in a cantilevered manner. The pair of support portions 11 have a plate shape parallel to the rocking direction of the rocker arm Ra, and both support portions 11 are formed with coaxial bearing holes 12 passing through in the left-right direction. The support portion 11 has a substantially triangular shape when viewed from the side, and the extending end portion of the support portion 11 has an arc shape concentric with the bearing hole 12. Further, the outer surface of the support portion 11 is recessed in a stepped manner compared to the peripheral region of the shaft fitting hole 18 in the arm body 10 and the outer surface of the region extending from the shaft fitting hole 18 to the rear end portion of the arm body 10. It has a form. That is, the width dimension of the front end portion where the support portion 11 is formed is smaller than the other width dimensions, and only the support portion 11 is narrow. Between the two support portions 11 is an accommodation space 13 opened upward, forward and downward, and a roller 20 is accommodated in the accommodation space 13.

ローラ２０は、円環形をなし、内周にニードルベアリング２１の外周を固着したニードルローラと称されるものである。ニードルベアリング２１の中心孔には、円柱形又は円筒形のシャフト２２が相対回転可能に嵌合されている。シャフト２２の両端部は、両支持部１１の軸受孔１２に嵌合され、図６及び図７に示すように、ポンチＰをシャフト２２の両端面に打ち込んでシャフト２２の両端部を拡径変形させることで、その拡径した部分が軸受孔１２に対して密着するように固着されている。これにより、シャフト２２の両端部が、軸受孔１２（支持部１１）に対して軸線方向の相対移動及び軸線回りの相対回転を規制された状態に固着され、もって、収容空間１３内に収容したローラ２０が一対の支持部１１によって回転可能に支持されている。支持部１１に取り付けられたローラ２０は、その外周縁部のうち少なくとも下端側部分を支持部１１よりも下方へ突出させた状態となっている。詳細には、ローラ２０の下端部から前端部に亘って支持部１１の外部へ突出している。   The roller 20 has an annular shape and is referred to as a needle roller in which the outer periphery of the needle bearing 21 is fixed to the inner periphery. A columnar or cylindrical shaft 22 is fitted into the center hole of the needle bearing 21 so as to be relatively rotatable. Both end portions of the shaft 22 are fitted into the bearing holes 12 of the both support portions 11, and as shown in FIGS. 6 and 7, the punches P are driven into both end surfaces of the shaft 22, and the both end portions of the shaft 22 are expanded in diameter. By doing so, the expanded portion is fixed so as to be in close contact with the bearing hole 12. As a result, both end portions of the shaft 22 are fixed in a state in which relative movement in the axial direction and relative rotation around the axial line are restricted with respect to the bearing hole 12 (support portion 11), and thus are accommodated in the accommodating space 13. The roller 20 is rotatably supported by the pair of support portions 11. The roller 20 attached to the support portion 11 is in a state where at least the lower end side portion of the outer peripheral edge portion protrudes downward from the support portion 11. Specifically, the roller 20 projects from the lower end portion to the front end portion to the outside of the support portion 11.

また、一対の支持部１１には、その延出端（前端）同士を連結する形態の連結部１４が一体に形成されている。連結部１４は、ローラ２０よりも前方であって、ローラ２０の回転中心とほぼ同じ高さに配置されており、これにより、ローラ２０を、連結部１４と干渉させることなく、下方から収容空間１３内に組み付けることができるようになっている。連結部１４は、支持部１１の前端から前方へ突出する一対の延出片１５と、この両延出片１５の延出端同士を繋ぐ連結片１６とからなる。延出片１５は、支持部１１に対して面一状をなす。即ち、延出片１５の外側面は支持部１１の外側面に対して面一状に連続し、延出片１５の内側面は支持部１１の内側面に対して面一状に連続する。つまり、延出片１５の左右方向の厚さ寸法Ｄａは支持部１１の厚さＤａと同じである。また、連結片１６の前後方向の厚さ寸法は、延出片１５の厚さと同じかそれよりも小さい寸法である。この連結片１６の後面（ローラ２０との対向面）は、ローラ２０と同心の円弧面となっている。この連結片１６の後面とローラ２０の外周面とは接近した位置関係となっている。一方、連結片１６の前面（ローラ２０と非対応の面）もローラ２０と同心の円弧面となっている。   The pair of support portions 11 are integrally formed with a connection portion 14 that connects the extended ends (front ends) thereof. The connecting portion 14 is disposed in front of the roller 20 and at substantially the same height as the rotation center of the roller 20, whereby the accommodation space is formed from below without causing the roller 20 to interfere with the connecting portion 14. 13 can be assembled. The connecting portion 14 includes a pair of extending pieces 15 protruding forward from the front end of the support portion 11, and a connecting piece 16 that connects the extending ends of the extending pieces 15. The extension piece 15 is flush with the support portion 11. That is, the outer surface of the extended piece 15 is flush with the outer surface of the support portion 11, and the inner surface of the extended piece 15 is flush with the inner surface of the support portion 11. That is, the thickness dimension Da in the left-right direction of the extension piece 15 is the same as the thickness Da of the support portion 11. Further, the thickness dimension of the connecting piece 16 in the front-rear direction is the same as or smaller than the thickness of the extending piece 15. The rear surface of the connecting piece 16 (the surface facing the roller 20) is an arc surface concentric with the roller 20. The rear surface of the connecting piece 16 and the outer peripheral surface of the roller 20 are in a close positional relationship. On the other hand, the front surface (surface not corresponding to the roller 20) of the connecting piece 16 is also an arc surface concentric with the roller 20.

本参考形態のロッカアームＲａは、一対の支持部１１をアーム本体１０から前方へ片持ち状に延出した形態となっているのであるが、一対の支持部１１の先端部同士を連結部１４によって連結したので、支持部１１が変形し難くなり、その分、支持部１１を薄肉化することが可能となった。図９及び図１０に示す従来のロッカアームＲと比較すると、本参考形態の支持部１１の厚さ寸法Ｄａは従来の支持部１０１の厚さ寸法Ｄよりも薄くしている。このように本参考形態では、支持部１１を薄肉化したことにより、支持部１１、即ちアーム本体１０の前端部を軽量化することが実現されている。 Rocker arm Ra of the reference embodiment, although has become a form extending cantilevered forwardly a pair of support portions 11 from the arm main body 10, the connecting portion 14 of the distal ends of the pair of support portions 11 Since it connected, it became difficult to deform | transform the support part 11, and it became possible to make the support part 11 thin by that much. Compared to conventional rocker arm R shown in FIGS. 9 and 10, the thickness Da of the support portion 11 of this preferred embodiment is thinner than the thickness D of the conventional support member 101. Thus in this preferred embodiment, by a supporting portion 11 was thinned, it is possible to reduce the weight of the front end portion of the support portion 11, i.e. the arm body 10 is realized.

＜実施形態１＞
以下、本発明を具体化した実施形態１を図８を参照して説明する。本実施形態１のロッカアームＲｂは、上記参考形態１のロッカアームＲａにおいて、ローラ２０にオイルを供給し易くするための手段として、連結部１４に受け片１７を設けたものである。受け片１７は、連結部１４の連結片１６から上方へ板状に延出させた形態であり、受け片１７の上端部は、前方（支持部１１）から離間する方向へ傾いている。
本実施形態１によれば、支持部１１の表面に付着しているオイルの一部は、ロッカアームＲｂの揺動が繰り返されることにより、支持部１１から斜め上前方へ弾き飛ばされ、はじき飛ばされたオイルは、受け片１７の後面（支持部１１と対向する面）で受け止められ、重力により受け片１７から連結片１６の後面へ流れ落ちる。連結片１６の後面はローラ２０の外周面に接近して配置されているので、連結部１４に流れ落ちたオイルはローラ２０に伝わる。
尚、受け片１７以外の構成については上記参考形態１と同じであるため、同じ構成については、同一符号を付し、構造、作用及び効果の説明は省略する。 <Embodiment 1 >
A first embodiment embodying the present invention will be described below with reference to FIG. Rocker arm Rb of the embodiment 1, in the rocker arm Ra of the Reference Embodiment 1, as a means to facilitate supplying oil to the roller 20, is provided with a receiving piece 17 in the connecting part 14. The receiving piece 17 is a form that extends upward in a plate shape from the connecting piece 16 of the connecting portion 14, and the upper end portion of the receiving piece 17 is inclined in a direction away from the front (supporting portion 11).
According to the first embodiment, a part of the oil adhering to the surface of the support part 11 is flipped off from the support part 11 diagonally upward and forward by repeated rocking of the rocker arm Rb. The oil is received by the rear surface of the receiving piece 17 (the surface facing the support portion 11), and flows down from the receiving piece 17 to the rear surface of the connecting piece 16 by gravity. Since the rear surface of the connecting piece 16 is disposed close to the outer peripheral surface of the roller 20, the oil that has flowed down to the connecting portion 14 is transmitted to the roller 20.
In addition, since it is the same as that of the said reference form 1 about structures other than the receiving piece 17, the same code | symbol is attached | subjected about the same structure and description of a structure, an effect | action, and an effect is abbreviate | omitted.

＜他の実施形態＞
本発明は上記記述及び図面によって説明した実施形態に限定されるものではなく、例えば次のような実施形態も本発明の技術的範囲に含まれる。
（１）連結部の数は複数でもよい。
（２）連結部の側面視形状は、円弧状以外の形状でもよい。
（３）連結部外側面は、支持部の外側面に対して段差状に連なった形態でもよい。
（４）ローラは、ニードルベアリングを備えたニードルローラに限らず、ローラを直接シャフトに取り付けたシングルローラや、シャフトとの間にインナローラを介在させたダブルローラとしてもよい。
（５）シャフトを軸受孔に固着する手段としては、シャフトを軸受孔に圧入してもよい。 <Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) The number of connecting portions may be plural.
(2) The side view shape of the connecting portion may be a shape other than the arc shape.
(3) The connection part outer surface may be in the form of a step with respect to the outer surface of the support part.
(4) The roller is not limited to a needle roller provided with a needle bearing, and may be a single roller in which the roller is directly attached to the shaft, or a double roller in which an inner roller is interposed between the rollers.
(5) As a means for fixing the shaft to the bearing hole, the shaft may be press-fitted into the bearing hole.

参考形態１のロッカアームの使用状態をあらわす側面図Side view showing the usage state of the rocker arm of Reference Form 1 ロッカアームの縦断面図Longitudinal section of rocker arm ロッカアームの平面図Top view of rocker arm ロッカアームの正面図Front view of rocker arm ロッカアームの横断面図Cross section of rocker arm ローラの組付け工程をあらわす部分拡大横断面図Partial enlarged cross-sectional view showing the roller assembly process ローラの組付け工程をあらわす部分拡大横断面図Partial enlarged cross-sectional view showing the roller assembly process 実施形態１のロッカアームの縦断面図Longitudinal sectional view of the rocker arm of Embodiment 1 従来のロッカアームの縦断面図Vertical section of a conventional rocker arm 従来のロッカアームの平面図Plan view of conventional rocker arm

Ｒａ…ロッカアーム
１０…アーム本体
１１…支持部
１４…連結部
２０…ローラ
Ｒｂ…ロッカアーム
１７…受け片 Ra ... Rocker arm 10 ... Arm body 11 ... Supporting part 14 ... Connecting part 20 ... Roller Rb ... Rocker arm 17 ... Receiving piece

Claims (1)

アーム本体の端部に、二股状に分かれて片持ち状に延出する形態の一対の支持部を形成し、
前記一対の支持部の間に配置したローラを、前記一対の支持部によって回転可能に支持したロッカアームであって、
前記一対の支持部における先端部同士を連結部によって連結し、
前記連結部を前記ローラに近接した位置に配置し、
前記連結部に、上方へ延出することで前記支持部の表面から弾き飛ばされたオイルを受け止める受け片を形成したことを特徴とするロッカアーム。 At the end of the arm body, a pair of support parts in a form that is divided into two forks and extends in a cantilever shape,
A rocker arm that rotatably supports the roller disposed between the pair of support portions by the pair of support portions,
The tip portions of the pair of support portions are connected by a connecting portion ,
Arranging the connecting part at a position close to the roller;
A rocker arm , wherein a receiving piece for receiving oil blown off from the surface of the support portion is formed on the connecting portion by extending upward .
JP2006253416A 2006-09-19 2006-09-19 Rocker arm Expired - Fee Related JP4601592B2 (en)

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JP4601592B2 true JP4601592B2 (en) 2010-12-22

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Publication number Priority date Publication date Assignee Title
JP5934511B2 (en) * 2012-01-26 2016-06-15 株式会社オティックス Support structure manufacturing method, caulking jig used in the method, and support structure

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59117812U (en) * 1983-01-29 1984-08-09 トヨタ自動車株式会社 Lubrication mechanism of rolling type Rocker arm
JPH0191931A (en) * 1987-10-01 1989-04-11 Mitsubishi Metal Corp Production of rocker arm
JPH0275708A (en) * 1988-09-06 1990-03-15 Henley Mfg Corp Boat type locker arm assembly
JPH0432210U (en) * 1990-07-11 1992-03-16
JPH05321616A (en) * 1991-02-15 1993-12-07 Honda Motor Co Ltd Cam follower incorporating roller

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59117812U (en) * 1983-01-29 1984-08-09 トヨタ自動車株式会社 Lubrication mechanism of rolling type Rocker arm
JPH0191931A (en) * 1987-10-01 1989-04-11 Mitsubishi Metal Corp Production of rocker arm
JPH0275708A (en) * 1988-09-06 1990-03-15 Henley Mfg Corp Boat type locker arm assembly
JPH0432210U (en) * 1990-07-11 1992-03-16
JPH05321616A (en) * 1991-02-15 1993-12-07 Honda Motor Co Ltd Cam follower incorporating roller

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